Drawing instrument



A ril 21, 1925. 1,534,396 A L. Y. KIMURA 1 DRAWING INSTRUMENT Filed March 1'7, 1924 WWW! HHHMHM; 1 2;

LawrenneYK-Lmura mm 22 /,9 2s mom? Patented Apr. 21, 1 925.

] UNITED"? STATESPAT'ENT :OF'FICE.

LAWRENCE rasoxrcm KIMURA, or monmom), canroimn.

DRAWING INSTRUMENT.

Application flled March 17, 1924. Serial No. 699,904.

To all whom it may concern:

Be it known that Lxwnnxon Y. KIMURA, a subject of the Empcrorof Japan, residing at Richmond, in the: county of Contra Costa, State of California, has invented certain new and useful Improvements in a Drawing Instrument, of which the following is a specification.

The piesent invention relates to draw;- ing instruments and more particularly to an improved means by which dotted, broken or dotted and broken arcuatc lines may be drawn with ease and precision.

In drawing dotted or broken arcuatc lines as with a compass or bow instrument, great care is necessary in order to produce the desired symmetrical appearance of the lines and spaces therebetween. This method requires the lifting and placing of the writ: ing leg of the instrument in order to produce the desired broken or dotted line.

The primary object of the invention therefore is to provide a device for use in connection with compasses or bow instruments whereby broken arcuate lines of various appearances may be drawn with precision and ease. I

A further object of the invention is to provide a device of the foregoing character whereby broken arcuate lines. of any desired diameter may be readily obtained.

A- further object of the invention is to provide sets of relatively flat, semi-circular shaped instruments 'for use in drawing,

whereby various appearing aa'cuate lines such as dotted lines, dot and dash lines etc.,

may be readily produced in an efficient and preclse manner.

Other ob ects and advantages of my invention will appear in the following detailed description, taken in connection with the accompanying drawing, forming a part of the specification, and in which drawing,

Figure 1is a top plan view of the improved device, the same being shown constructed for use in drawing arcuate dotted lines.

Figure 2 is asectional view taken on the line 2-2 of Figure 1 and looking in the direction of the arrows.

Figure 3 is a fragmentary sectional view taken on the hne 3-3 of Figurevl and look: ing in the d rection of the arrows.

Figure 4 is a fragmentary top plan view of a slightly modified form of the mventmn,

the same being shown constructed for use in drawing arcuate broken and dotted lines.

Figure 5 is a fragmentary sectional view taken on the line 5-5 of Figure 4 and looking in the direction of the arrows.

Figure 6 is a fragmentary top plan view of a' further modified form of the invention,

the same being shown constructed for use jor are having its center lying inwardly of the marginal edge 13 of the straight edge 11. A hub portion 14 formed centrally of the straight edge 11 and extending inwardly thereof, is provided with an elongated right angularly extending notch 15 which opens V band '10 and straight edge 11 of the body 12 define a maupon the marginal edge 13 of the straight edge 11. The object of this notch is to enable the device to be readily slid into position about the needle point leg of a. compass orbow instrument after the needle point leg has been set at the desired center for striking the dotted or broken line are.

This elongated notch also permits of the raising of the arcuate portion 10 when desiring to remove the instrument after inking by allowing the instrument to pivot at the marginal edge 13.

Concentrically arranged semi-circular shaped dividing bands 16 and 17- having their ends formed integral with the straight edge 11, are preferably of a thickness equal to that of the marginal band 10Jand straight edge 11. These bands are adapted to divide the radially extending spaced apart ribs 18. into inner, outer and intermediately disposed groups 19, 20 and 21 respectively. The object of these dividing bands 16 and 17 is to permit of the instrument to'be-used for any desired are within the limits of the arcuate marginal band 10 and hub portion placing of a greater number of ribs in each successive larger arcuate group of ribs as clearly shown in Figure 1.

The radially extending ribs 18, which are preferably of segmental shape'in cross section, have their flat bottom faces 22 flush with the bottom face 23 of the instrument A and their arcuate upper faces 24 lying in a plane-below the upper face 25 of the instrument. The longitudinal edges of the ribs 18, are rabbeted as at 26 in order to facilitate use of the instrument, when inking in; by preventing the ink from coming into contact with the bottom faces 2:2 of the ribs. It will be seen that by so arcuating the upper faces of the ribs 18 that an easy riding surface will be provided for the writing leg of the compass or bow instrument when drawn in an arcuate path across the radially extending ribs, and by so positioning these arcuate faces 24 below the upper face 25 of the instrument, the same will be protected from injury when the instrument is placed bottom side up.

In the examples shown, Figures 1, 2 and 3 show a form for producing arcuate dotted lines, Figures 4 and 5 a form for producing arcuate dot and dash lines and Figures 6 and 7 a form for producing arcuate double dot and dash lines.

iVhile the instrument has been shown by way of example, the manner in which three differently appearing arcuate lines may be drawn, it is to be understood that various other appearing lines may be drawn by difi'erently positioning the radially extending spaced ribs without departing from the spirit or scope of my invention; but,

I claim:

1. A drawing instrument for use in producing arcuate dotted or broken lines consisting of a body having a hubprovided with a notch and radially extending spaced apart ribs formed on said hub.

2. A drawing instrument for use in pro ducing arcuate dotted or brokenlines consisting of a body formed with an arcuate marglnal band and a straight edge, a hub formed centrally of said straight edge and radially extending spaced apart ribs connecting said hub and band.

3. A drawing instrument for use in producing arcuate dotted or broken lines consisting of a body formed with an arcuate marginal band and a straight edge, a hub formed centrally of said straight edge and radially extendingspaced apart ribs formed with an arcuate upper face connecting said hub and band.

4. A drawing instrument for use in producing arcuate dotted or broken lines con-- sisting of a body formed with an arcuate marginal band and a straight edge, a hub formed centrally of said straight edge and radially extending spaced apart ribs having their bottom faces lying in a plane with the bottom faceof said instrument and their upper faces lying in a plane below the upper face of the instrument, connecting said hub and band.

5. A drawing instrument for use in producing arcuate dotted or broken lines consisting of a body formed with an arcuate marginal band and a straight edge, a hub provided with an outwardly opening notch formed centrally of said straight edge and radially extending spaced apart ribs connecting said hub and band.

6. A drawing instrument for use in producing arcuate dotted or broken lines consisting of a body formed with an arcuate marginal band and a straight edge, concentricallyv arranged dividing bands arranged inwardly of said marginal band, a hub formed centrally of said straight edge and radially extending spaced apart ribs connecting said marginal band and hub with said dividing bands.

7. A drawing instrument for use in producing arcuate dotted or broken lines consisting of a body formed with an arcuate marginal band and a straight edge, a hub formed centrally of said straight edge and radially extending spaced apart ribs connecting said hub and band, said ribs being divided intermediate said marginal band and hub and forming arcuate groups of ribs having a greater number of ribs in each successive larger group.

8. A drawing instrument for use in producing arcuate dotted or broken lines consistin of a body formed with an arcuate margmal band and a straight edge, concentrically arranged dividing bands arranged inwardly of said marginal band and having their ends terminating in said straight edge and radiallyextending spaced apart ribs connecting said marginal band and hub with said dividing bands, said ribs defining arcuate groups of ribs having a greater number" of ribs in each successive larger group.

LAWRENCEXASUKlCl-H KIMURA. 

